How to Get Putty to Work in Ubuntu
Add this stuff to the top of /etc/ssh/ssh_config
KexAlgorithms=+diffie-hellman-group1-sha1
Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc
HostKeyAlgorithms ssh-rsa
PubkeyAcceptedKeyTypes ssh-rsa
Getting putty to work in Ubuntu
sudo apt-get update
sudo apt install putty
Go to fonts menu and change fonts to Ubuntu.